Atag iC Economiser 27 - Volt Free Connections

PLUG FUNCTION PINS VOLTAGE RESISTANCE
X1 Pump (PWM) pulse-width modulation 1 - 2 0.6 – 4.9v DC
X2
Water flow sensor
No demand
1 – 2 4v DC
1 – 3 0v DC
2 - 3 4v DC
Water flow sensor
DHW demand
1 – 2 4v DC
1 – 3 1v DC
2 – 3 2v DC
Link 4 - 5 0Ω
x4
Flow sensor T1 1 – 2 10KΩ@ 25°C
Return sensor T2 3 - 4 10KΩ@ 25°C
x5
ATAG BUS OpenTherm controller / room thermostat option Blue (BUS) 34v DC
On / O room thermostat volt free / timer option Black (On / O)
External timer CH option White (CH timer)
External timer HW option White (HW timer)
DHW cylinder sensor Yellow (DHW) 10KΩ@ 25°C
Outside sensor T4 option Peach (Out) 1KΩ@ 25°C
X6 Fan ontrol
X7
DHW sensor T3 8 – 9 10KΩ@ 25°C
Water pressure sensor P1 (@ + 1.0bar)
5 – 6 32v DC
5 – 7 22v DC
6 - 7 11v DC
X8
230v Power supply 1 – 2 230v
230v External timer option 4 – 5 230v
X9 230v control
1 – Neutral 230v 12.4
2 – Neutral 230v (SWL in)
X10 DHW on CH on
1 – 2 230v 14v
1 – 3 30v 230v
2 – 3 230v 230v
X11
Fan 1 – 2 230v
Neutral 4
X12
Gas valve 1 - 2 100v
Spark generator (ignition) 3 - 4 230v
Ionisation probe 5
X13 Service connector
X17 Earth
E
N
L
SwL
230V out
230V Control
COLOUR DESCRIPTION
Peach ATAG outside sensor (1KΩ@ 25°C)
Yellow DHW cylinder sensor (Used with 3 port diverter kit on system boiler)
White
(DHW)
ATAG programmer for DHW timer
White (CH) ATAG programmer for CH timer
Black On / O room thermostat volt free / timer option
Blue ATAG BUS OpenTherm controller / room thermostat option
Volt free
connections
DO NOT CONNECT 230V
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